Riding etiquette

So I’m a new rider. And wanted to know if I was in the wrong or exactly what to do. I was on the freeway in the far left lane put in lane position one so close to the middle lane and a rider came up behind me and stayed about 30 to 40 feet away on my left side in lane position three still in the far left lane. We rode about 5 miles like that. I waved to him. He never waved back and then shot off to another freeway. Was I supposed to move over into the middle lane or move over to the far left side of my lane to let him pass they never really explained this in the MSF course. I hope I wasn’t holding him. I was going roughly 75 in a 70